1) MacRumors seems to have completely obliterated from its
2018 iPhones roundup the forthcoming new iteration of iPhone SE, which will be assembled at least in India. Being the entry-point iPhone, it will be a key component of the 2018 iPhone lineup and, i.m.o., it may deploy a low-cost 2GB RAM A12.
2) The A12 cpu is a must across the entire 2018 iOS lineup since it is likely to be the first A-line cpu to carry reliable hardware-based patches for the Security Enclave Processor (SEP) hack by xerub, and the Meltdown & Spectre vulnerabilities, both supposedly known by Apple since summer 2017 (so Apple had enough time to hardware-patch and re-design the A11).
3) I wouldn't be surprised to discover that the HomePod carries a special updated version of the A8 processor including hardware-based patches for the SEP hack by xerub, and the Meltdown & Spectre vulnerabilities. How could an old A8 still be used for pervasive Siri-centered home use considering the A8 privacy now potentially flawed, after all these recent Class Actions?
4) The same logic may apply to the forthcoming iPod Touch 7th generation (if any): being one of the most popular mHealth field test sensor unit for Apple ResearchKit and CareKit, how could a regular A9, despite being an upgrade from the A8-based iPod Touch 6th, still be deployed in an iPod Touch 7th if its privacy is inevitably flawed today in such a privacy-sensitive sector such as healthcare?
Bottom line:
If I was Apple, I wouldn't be releasing in 2018 iOS devices with A-cpu still tainted by these privacy threats (SEP xerub hack + Meltdown & Spectre) and which cannot be efficiently eliminated via software-only patches.
By radically refreshing the A-cpu in its entire 2018 iOS line, Apple would be renewing and boosting its marketing message of "THE privacy-wise" company.
This is also the reason, i.m.o., why Apple may leave no 2017 iPhone model still for sale by the end of 2018.